1 files changed, 47 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseLib/Ia32/MultU64x64.asm b/OldMdePkg/Library/BaseLib/Ia32/MultU64x64.asm
new file mode 100644
index 0000000000..f3679548f1
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/MultU64x64.asm
@@ -0,0 +1,47 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation
+; All rights reserved. This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+;   MultU64x64.asm
+;
+; Abstract:
+;
+;   Calculate the product of a 64-bit integer and another 64-bit integer
+;
+;------------------------------------------------------------------------------
+
+    .386
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalMathMultU64x64 (
+;   IN      UINT64                    Multiplicand,
+;   IN      UINT64                    Multiplier
+;   );
+;------------------------------------------------------------------------------
+InternalMathMultU64x64  PROC    USES    ebx
+    mov     ebx, [esp + 8]              ; ebx <- M1[0..31]
+    mov     edx, [esp + 16]             ; edx <- M2[0..31]
+    mov     ecx, ebx
+    mov     eax, edx
+    imul    ebx, [esp + 20]             ; ebx <- M1[0..31] * M2[32..63]
+    imul    edx, [esp + 12]             ; edx <- M1[32..63] * M2[0..31]
+    add     ebx, edx                    ; carries are abandoned
+    mul     ecx                         ; edx:eax <- M1[0..31] * M2[0..31]
+    add     edx, ebx                    ; carries are abandoned
+    ret
+InternalMathMultU64x64  ENDP
+
+    END